Prince performs surprise hit on London fashion show catwalk

The American singer, who is playing a series of concerts in London at the 02 Arena, at first appeared to be only a front row guest at the spring-summer 2008 collection.

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Prince gave a rocking surprise performance on the catwalk

But the usual fashion scene in Belgravia became a pop concert venue when a Prince track struck up and the first two models onto the catwalk - a pair of identical twins - started to dance.

Prince, wearing a black suit and hat, then began singing into a microphone from his seat before jumping up and performing from the start of the runway flanked by his band.

By that time, many in the audience, who included musician Sting's wife actress Trudie Styler, were on their feet snapping photos with their mobile phones and clapping as he sung his hit "U Got the Look".

"He really wanted to do this, and you don't say 'No' to Prince," Williamson said after the show.

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Fashion goers were surprise when the models (Prince's backing dancers) started to groove

The designer has always been fortunate in his celebrity support. Kate Moss, Helena Christensen and Jade Jagger modelled in his first show.

Williamson is celebrating 10 remarkably successful years as a designer and has a shop in Mayfair and a second job as creative director of Pucci. The Design Museum will stage a retrospective of his career in October.

After the unexpected start, he sent his models down the catwalk in richly embroidered skirts and dresses.

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Prince began the show in the front row as an apparent guest

Striped jackets - a theme throughout London Fashion Week - were offset with bold splashes of blue, pink and orange.

The show closed to the strains of Prince's "Kiss" from his best-selling 1986 album "Parade".